re: BMP editing problems
Please start over, open a NVFOREST.DAT, press "Export Textures".
Pick a .BMP and edit it with MSPaint/PBrush. Make a trivial edit.
Try "Import Textures". If it fails, please email me the offending .BMP file ([email protected])
Some people have had problems with defaults changing the formats on them. I'll beef up the warnings to give better advice to avoid the format changes.